Since there have been so many changes from version 4.8 to 5.0.594, I suggest an uninstall of Avast and
CLEAN install:
1. Save a copy of newest version of Avast (5.0.594) for the version you need and save it to your HDD:
Free –
http://files.avast.com/iavs5x/setup_av_free.exe 2. Download the Avast Uninstall Utility, aswClear5.exe
http://www.avast.com/uninstall-utility and save it to your HDD (it has uninstall tools for both 4.0 and 5.0).
Since you had 4.0 and 5.0 on your machine, uninstall both.3. Disconnect from the Internet at this time; turn off your connection from the Internet.
4. Uninstall Avast through "Add/Remove Programs" through Control Panel.
5. Boot into
Safe Mode (hit F8 repeatedly) and run the Avast Uninstall Tool.
6.
Reboot twice.
7. Clean your computer up (clean up cache, temporary Internet files, etc.). **[See below - CCleaner]
8. Install the newest version of Avast and
reboot twice.
9. Get Internet access and update Avast definitions.
10. Register your copy or add the license key for Free.
11. Reset your settings, if needed.
Please post your results. Thank you.
**
CCleaner http://www.piriform.com/ccleaner is a freeware system optimization, privacy and cleaning tool. It removes unused files (cache, temporary Internet files, etc.) from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. Additionally it contains a fully featured registry cleaner. Remember
when installing CCleaner to uncheck the Yahoo toolbar.
I will be signing off, but there are others here to help if needed since this will take a little time. I will check back with you later.